Abstract

The deuteron quadrupole coupling constant eQV zz / h in squaric acid amounts at room temperature to 142 ± 2 kHz and the asymmetry parameter η is 0.21. The data show that the deuteron is located in an off-centre position below T c and that all O D O bonds are equivalent within the limits of experimental error. The weak temperature dependence of eQV zz / h suggests an order-disorder rather than a displacive nature for the phase transition.

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